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Part Number T/A54930
Part Number: BIT-DEWSFC1-1/4-60
Part Number: EZ-EZ-329-428
Part Number CTH3562
Size: 9/32"
5/16" X 3/32" HSS Aircraft Counterbore 1/4" Shank Shopify Collective Part Number T/A54930Product Description Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and
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